Array crystal module and machining method thereof

A processing method and crystal technology applied in the field of positron emission tomography equipment to achieve high-precision cutting and processing, ensure sensitivity and energy information acquisition accuracy, and optimize system performance

Active Publication Date: 2015-03-18
RAYCAN TECH CO LTD SU ZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In view of this, the object of the present invention is to provide an array crystal module and its processing method that can effectively solve the problem of crystal light output loss under the premise of ensuring detection efficiency

Method used

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  • Array crystal module and machining method thereof
  • Array crystal module and machining method thereof
  • Array crystal module and machining method thereof

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Embodiment 1

[0112] Design of a clinical PET detector using an optoelectronic device package with a surface area of ​​4x4mm 2 , the effective working area is 3x3mm 2, the predetermined detector is for the purpose of pursuing high temporal resolution. At present, the commonly used LYSO crystals used in commercial clinical PET usually have a thickness between 20 and 35 mm. If the crystal is too small, the sensitivity is too low to meet the detection requirements. If the crystal is too large, the thickness of the crystal will lead to excessive transmission loss of visible light photons in the crystal. The time resolution will decrease. Here, because the detector pursues high time performance, the overall thickness of the crystal is set to 20mm-22mm. At the same time, in order to ensure the sensitivity of the whole crystal to 511KeV (ray energy that PET needs to detect) rays, the thickness of the right square prism is generally set at 10-17mm. Then the thickness of the conical pedestal part ...

Embodiment 2

[0114] Design a nuclear radiation detector using an optoelectronic device package with a surface area of ​​6x6mm 2 , the effective working area is 3x3mm 2 , the predetermined detector pursues high sensitivity. In order to improve the detection efficiency of the detector for high-energy rays, the total thickness of the crystal is set to 38-40 mm, and the thickness of the right square prism is set to 30-35 mm. In the same way, it can be calculated that the inclination angle is between 17 degrees and 45 degrees.

[0115] From this, it can be deduced that the characteristics of optoelectronic devices affect the crystal inclination angle and the thickness of the right quadrangular prism:

[0116] The smaller the ratio of the effective detection area of ​​the optoelectronic device to its packaging area, the larger the crystal inclination angle will be. The thickness of the right square prism = the total thickness of the crystal - the thickness of the conical truncated part, and th...

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Abstract

An array crystal module comprises a plurality of unit crystal strips (10). The exterior three-dimensional shape of the array crystal module is a frustum (12) or a combination of a right quadrangular prism (11) and the frustum (12), and the frustum (12) is used to be coupled with a photoelectric device (20). The frustum (12) comprises a first bottom face coupled with the photoelectric device (20) and a first top face opposed to the first bottom face, and the area of the first bottom face is smaller than that of the first top face. A fabrication method of the array crystal module includes: fabricating a crystal strip blank to obtain a unit crystal strip, performing the die cutting to obtain a unit crystal strip in the shape of a frustum or a unit crystal strip in the shape of a combination of a right quadrangular prism and a frustum according to a set obliquity and the thickness of the right quadrangular prism part, and assembling the unit crystal strips together to form an array crystal module. The above array crystal module, on the premise that the detection efficiency is guaranteed, can solve the problem of the light output loss of the crystal caused by the fact that the effective detection area of a photoelectric conversion device is smaller than a packaging area, thereby guaranteeing the sensitivity and performance of a detector.

Description

technical field [0001] The invention relates to the field of positron emission tomography equipment, in particular to an array crystal module and a processing method thereof. Background technique [0002] Scintillation crystals are substances that can convert X-ray particles and γ-ray particles into visible light photons. The common ones are BGO, NaI(T1), CsI(T1), LSO / LYSO, PWO, etc. They usually have strong radiation absorption ability, The light output is large, and the number of output photons is linearly related to the absorbed ray energy. [0003] Scintillation crystals are often combined with photoelectric conversion devices to form detectors, which are used in nuclear medicine, environmental monitoring, customs security inspection, geological exploration and other fields. In this detector, the scintillation crystal absorbs the ray energy and generates a certain number of visible light photons corresponding to the energy. The photoelectric device is used to receive th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/202
CPCG01T1/202G01T1/2002H01L27/14663H01L27/14685G01T1/20187
Inventor 谢庆国曾晨奚道明
Owner RAYCAN TECH CO LTD SU ZHOU
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